BTE 210 2nd exam 1st week notes
BTE 210 2nd exam 1st week notes BTE 210
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This 4 page Class Notes was uploaded by aharon Notetaker on Friday February 12, 2016. The Class Notes belongs to BTE 210 at University of Miami taught by Maikel Leon Espinosa in Summer 2015. Since its upload, it has received 71 views. For similar materials see Fundamentals of Business Technology and Innovation in Business Administration at University of Miami.
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Date Created: 02/12/16
CHAPTER 8 Wireless: There are different wireless transmission media. Transmit signal without wires. Representative’s channels we are going to study: Major Types of Wireless Media Channels: Line of sight: 1. Microwave 2. Satellite 3. Infrared 4. Radio: Travel throught the air WTM: Wireless Transmission Media 1. Microwave: -High volume, long distance, point-to-point communication. -Towers cannot be spaced more than 30 miles apart. -Susceptible to environment (Polem). -Require line-of-sight. -Transmission of digital and a nalog signals, such as long- distance telephone calls, television programs, and computer data. 2. INFRARED: -Short distance connection, (the control remote with the tv is infrared) ----These light is not visible to human eyes. - You can use digital camera flash to see the infrared light. 3. Satellite: special kind of wave, they are characterized for having high bandwidth, they can cover lot of area but it is more expensive. a. Geostationary earth orbit (GEO) b. Middle earth orbit (MEO) c. Low earth orbit (LEO) a. GEO: -around 22.000 miles -TV use -8 needed to cover planet -transmission delay is not much -expensive to be built and launched -longest orbital year b. MEO -6.400 miles -GPS, global position system -We use this daily -24 to connect the entire network -Medium power transmitter -6-12 years of orbital life c. LEO -400-700 MILES away -They move faster -Almost no delay -Large number needed for global coverage -Less expensive to build and launch -Requires only low power transmitter Wireless computer Networks and Internet Access 1. Short Range 2. Medium Range 3. Wide-Are 1. Short- Range: a. Created for small personal area networks b. For example: i. Bluetooth 1.0: can link up to 8 devices within 10- meter with a bandwidth of 700 Kbps ii. Bluetooth 4.0: can transmit up to 25 Mbps within 100-meters (300 feet) 2. Medium-Range: a. Contains different protocol of wireless fidelity. b. Allows to have one access point and can create different wide area networks c. Wireless Fidelity (Wi-Fi): WLAN (Wireless Local Area Networks) Wireless security major threats: – Radio Frequency Jamming: A person or a device intentionally or unintentionally interferes with your wireless network transmissions. – Evil Twin: Using a hotspotter an attacker simulates a wireless access point with the same wireless network ESSID, as the one that authorized users expect. Users will connect to the attacker’s system instead of the real access point. attacker simuletes a wireless acces point with the same wireless network. Wireless Devices Advantages: – Small enough to easily carry or wear. – Sufficient computing power to perform productive tasks. – Communicate wirelessly with the Internet & other devices Wireless Disadvantage for Business – Workers can capture and transmit sensitive proprietary information Dematerialization: occurs when the functions of many physical devices are included in one other physical device. For example: Nowadays smartphones have everything including alarm, games, GPS 3. Wide-Area Wireless Networks -Cellular Radio (Cellular telephones) – 1G: used analog signals and had low bandwidth. – 2G: uses digital signals primarily for voice communication; it provides data communication up to 10 Kbps. – 3G: uses digital signals and can transmit voice and data up to 128 Kbps when it is moving in a car, 384 Kbps when the device is moving at a walking pace, and up to 2 Mbps when in a fixed location. – 4G: in theory, 100 Mbps for high-mobility communications such as cars and trains, and 1 Gbps for low-mobility communications such as pedestrians. A 4G system is expected to provide a secure all-IP-based mobile broadband system to all types of mobile devices. Many of the current “4G” offerings do not meet the International Telecommunications Union (ITU) specified speeds, but they call their service 4G nonetheless. – LTE (Long Term Evolution): technology designed to support roaming Internet access via smartphone and handheld devices. – XLTE (advance LTE): designed to handle network congestion when too many people in one are try to access an LTE network. Provide all users with no decrease in bandwidth. – 5G: expected to be deployed by 2020, predicted to be faster and more “intelligent” than previous generations. Mobile Computing and Mobile Commerce 1. Mobile Computing: -Real-time connection between a mobile device and another computing environments for example Internet - Mobility and broad reach create five value-added attributes that break the barriers of geography and time: • Ubiquity • Convenience • Instant connectivity • Personalization • Localization of products and services 2. Mobile Commerce: Transactions conducted in a wireless environment, via the Internet. Identifiers: • Universal Product Code (UPC) – Bar code where the first digit identifies the item type, the next five digits identify the manufacturer; the next five identify the product, etc… • QR code – Two-dimensional code, readable by dedicated QR readers. • RFID Systems – Tags have embedded microchips, which contain data, and antennas to transmit radio signals over short distances. Exampkes of IOT in use • The Smart Home • Healthcare • Automotive • Environmental monitoring • Energy management • Agriculture • Transportation
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